Serum progesterone in various species

Hormone

Species/status

Reference intervals

Comments

Progesterone (Note conversion factor 3.18 nmol/L = 1 ng/mL)

Canine - bitch, anestrus

            - spayed

<3.0 nmol/L

<1.5 nmol/L

Canine - bitch in season, prior to LH surge

            - following LH surge

<3-6 nmol/L

>3-6 nmol/L

Varies in bitches relative to LH surge

Canine - bitch, post-ovulation

> 11-12 nmol/L

Concentrations reflect those of pregnancy or pseudopregnancy.

Canine - bitch, prepartum, first stage of labour

<6.4 nmol/L

Feline – queen, anestrus or spayed

<1.5 nmol/L

Feline – queen, diestrus, day 15

31 - 130 nmol/L

Concentrations reflect those of pregnancy or pseudopregnancy.

Equine – estrus/anestrus

<3.2 nmol/L

Equine - diestrus/pregnant

6-65 nmol/L

Assay in current use does not react significantly with progestins produced in latter portion of pregnancy, therefore best suited for use in early pregnancy

Bovine - estrus

<3.2 nmol/L

Bovine - diestrus/pregnant

>3.2 nmol/L